Finding the Third Proportional to 69,381.56 and 149,287.78

Step by Step Solution

1. Step 1: Write the proportion equation
   69,381.56 : 149,287.78 = 149,287.78 : x
2. Step 2: Convert to fraction form
   69,381.56/149,287.78 = 149,287.78/x
3. Step 3: Cross multiply
   69,381.56x = 149,287.78 × 149,287.78
4. Step 4: Simplify right side
   69,381.56x = 22,286,841,630.55
5. Step 5: Solve for x
   x = 22,286,841,630.55/69,381.56
6. Step 6: Final answer
   x = 321,221.39